Chapter 5 Quiz B

Question 1

The backup timer should cut off at _________ or _____________, whichever comes first.

Answer 1

6 seconds
600 mAs

Question 2

X-ray system reciprocity has an acceptance parameter of:

a.) 20%
b.) 15%
c.) 5%
d.) 10%

Answer 2

d.) 10%

Question 3

What will likely happen if “blooming” has occured?

a.) image detail will be degraded
b.) contrast and density will be altered
c.) pitting of the anode will result
d.) the anode will fail to rotate

Answer 3

a.) image detail will be degraded

Question 4

Radiographic kVp should be evaluated:

a.) annually
b.) monthly
c.) semiannually
d.) weekly

Answer 4

a.) annually

Question 5

If the actual SID doesn’t match the SID set by the technologist, what two things can occur?

a.) image distortion
b.) excessive density
c.) increased patient dose
d.) excessive contrast

Answer 5

a.) image distortion
c.) Increased patient dose

Question 6

The xray beam and bucky tray must be aligned within ________% of the SID.

a.) 5
b.) 1
c.) 10
d.) 2

Answer 6

b.) 1

Question 7

Beam quantity measures:

a.) mAs
b.) kVp
c.) AEC
d.) timer accuracy

Answer 7

a.) mAs

Question 8

Collimation systems equipped with positive beam limitation must be accurate within ________ % of the SID.

a.) 5
b.) 2
c.) 4
d.) 3

Answer 8

d.) 3

Question 9

A high frequency generator can use current that been altered to as much as ___________ Hz before being rectified.

a.) 100,000
b.) 120
c.) 60
d.) 60,000

Answer 9

a.) 100,000

Question 10

A 3 phase-12 pulse generator will produce how many pulses in one second?

a.) 360
b.) 1/1000
c.) 720
d.) 1/120

Answer 10

c.) 720

Question 11

A quality control program for radiographic equipment should include which of the following:
1.) visual inspection
2.) enviromental inspection
3.) performance testing

a.) 1, 2 and 3
b.) 1 and 2 only
c.) 1 and 3 only
d.) 2 and 3 only

Answer 11

a.) 1, 2 and 3

Question 12

The minimum filtration required for general purspose radiography and fluoroscopy is:

a.) 2.5 mm
b.) 2.0mm
c.) 2.3 mm
d.) 3.5 mm

Answer 12

a.) 2.5mm

Question 13

Which of the following can be used to measure effective focal spot size?

a.) pinhole camera
b.) ion chamber
c.) densitometer
d.) solid state detector

Answer 13

a. ) pinhole camera

Question 14

The variability for timer accuracy for exposure times greater than 10 ms is _________%

a.) 2
b.) 20
c.) 5
d.) 10

Answer 14

c.) 5

Question 15

If there is inaccurancy of the timer, what could result?

a.) excessive contrast
b.) increased patient dose
c.) insufficient density
d.) image distortion

Answer 15

b.) increased patient dose

Question 16

If mas is increased in increments then the radiation output should increase in the same sequential change. This is called:

a.) linearity
b.) accuracy
c.) reproducibility
d.) reciprocity

Answer 16

a.) linearity

Question 17

If the kvp stated on the console matches the actual x ray energy this is called:

a.) accuracy
b.) reproducibility
c.) reciprocty
d.) linearity

Answer 17

a.) accuracy

Question 18

A pinhole camera and a star pattern are test tools for:

a.) kvp
b.) focal spot size
c.) mas
d.) exposure timer

Answer 18

b.) focal spot size

Question 19

Central ray congruency is also known as:

a.) linearity
b.) detent alignment
c.) light field radiation field congruence
d.) beam/bucky alignment

Answer 19

d.) beam/bucky alignment

Question 20

Output radiation intensity should be reproducible to within:

a.) 5%
b.) 1 %
c.) 10%
d.) 5%

Answer 20

c.) 10%

Question 21

In regards to an AEC system, the ___________ receives the current signal sent by the sensor and terminates the exposure.

a.) element
b.) backup timer
c.) comparator
d.) detector

Answer 21

c.) comparator

Question 22

Focal spot size affects which part of the image?

a.) contrast
b.) scatter
c.) spatial resolution
d.) density

Answer 22

c.) spatial resolution

Question 23

The wall of the control booth must be at least _________ ft high.

Answer 23

7

Question 24

Which type of generator uses multiple sources of alternating current so that the voltage never drops to zero?

a.) high frequency
b.) single phase
c.) three phase
d.) failing load

Answer 24

c.) three phase

Question 25

Two common quality control tests that should be performed on grids are grid ________ and grid __________ tests.

a.)ratio, alignment
b.) ratio, frequency
c.) alignment, uniformity
d.) uniformity, ratio

Answer 25

c.) alignment, uniformity